JP7724175B2 - Joint structure - Google Patents

Description

This disclosure relates to a joint structure for joining deck slabs.

JP 2020-186614 A describes a precast deck slab connection structure and a connection construction method. In the precast deck slab connection structure, multiple precast deck slabs are installed on top of a bridge girder. Each precast deck slab has a connection end that faces the other precast deck slabs.

The connecting ends are fitted with joint rebar, and the top ends of the connecting ends are formed with cutout recesses of a specified height. Top connecting members are installed in the pair of cutout recesses of the pair of precast deck slabs. Each connecting end also has an uneven surface, and filler hardening material is filled between the uneven surfaces of the pair of connecting ends.

Japanese Patent Application Laid-Open No. 2020-186614

However, when a vehicle such as a car passes over a deck slab, the joints between a pair of deck slabs can open up. When the joints open up, water can get in through the opening, which can cause the joint rebars to rust. Epoxy resins and other coatings are sometimes applied to the joint rebars to prevent rust. However, since coatings such as epoxy resins can peel off, there is room for improvement in terms of the reliability of corrosion prevention. Therefore, there is a need for more reliable methods of suppressing corrosion of the components that make up the deck slab.

The purpose of this disclosure is to provide a deck slab joint structure that can more reliably suppress corrosion of the components that make up the deck slab.

The joint structure according to the present disclosure comprises a first slab extending in a bridge axis direction, a bridge axis-perpendicular direction perpendicular to the bridge axis direction, and a height direction perpendicular to both the bridge axis direction and the bridge axis-perpendicular direction; a second slab facing the first slab and extending in the bridge axis direction, the bridge axis-perpendicular direction, and the height direction; and a filler material filled between the first and second slabs. The first slab has a first end face facing the second slab, and the second slab has a second end face facing the first slab. The first end face is formed with a first convex portion protruding toward the second slab and a first concave portion recessed in a direction away from the second slab, and the second end face is formed with a second convex portion protruding toward the first slab and a second concave portion recessed in a direction away from the first slab. The first deck slab has a first continuous fiber reinforcement material protruding from a first end face, and the second deck slab has a second continuous fiber reinforcement material protruding from a second end face, and the first continuous fiber reinforcement material and the second continuous fiber reinforcement material are made of a material that has higher rust resistance than steel bars and is more corrosion-resistant than iron .

In this joint structure, the first deck slab has a first end face facing the second deck slab, and the second deck slab has a second end face facing the first deck slab. Filling material is filled between the first and second end faces. The first deck slab has a first continuous fiber reinforcement member protruding from the first end face, and the second deck slab has a second continuous fiber reinforcement member protruding from the second end face. Therefore, the first and second continuous fiber reinforcement members, which are not rebar but rust-resistant, protrude from the first and second end faces, respectively, reducing the possibility of corrosion. This more reliably suppresses corrosion of the deck components and increases the reliability of corrosion prevention. Furthermore, the first end face is formed with a first convex portion protruding toward the second deck slab and a first concave portion recessed away from the second deck slab. The second end face is formed with a second convex portion protruding toward the first deck slab and a second concave portion recessed away from the first deck slab. This allows the shear force acting between the first and second decks and the filler to be transmitted more effectively, thereby increasing shear strength.

The first convex portion and the second convex portion may each protrude in side view, and the first concave portion and the second concave portion may each be recessed in side view.

The joint structure includes support members (such as main girders) that support the first and second decks, and the first and second decks may face each other at the top of the support members. The first and second convex portions may each protrude in a plan view, and the first and second concave portions may each be recessed in a plan view. In this case, the first and second decks face each other on the support members. When the joint between the first and second decks is located on the support members, negative bending, which results in upper edge tension, may act on the joint. In contrast, in the joint structure described above, the first and second continuous fiber reinforcement members are fixed to the first and second decks and filler material, thereby resisting the negative bending. Furthermore, the first and second convex portions protrude in a plan view, and the first and second concave portions are recessed in a plan view. In other words, with this joint structure, the first end surface and second end surface have an uneven shape when viewed from above, which allows horizontal shear forces to be more effectively transmitted to the first and second decks and the filler material.

The joint structure may include support members that support the first and second slabs, and shear stop members that protrude upward from the support members. In this case, the shear stop members transmit horizontal shear forces between the support members and the filler material, and the unevenness of the first and second slabs allows horizontal shear forces to be transmitted between the filler material and each of the first and second slabs. This more reliably prevents the filler material and the first and second slabs from shifting relative to the support members.

The first and second decks may not have rebar and may be made of fiber-reinforced concrete. In this case, the absence of rebar in the first and second decks more reliably prevents corrosion of the components that make up the first and second decks. Furthermore, the absence of rebar in the first and second decks and the fiber-reinforced concrete allows the first and second decks to be made thinner while maintaining high strength.

The filler may be made of ultra-high-strength fiber-reinforced concrete. In this case, the distance between the first and second end faces can be shortened while maintaining high strength, and reinforcing bars placed between the first and second end faces can be eliminated.

This disclosure makes it possible to more reliably suppress corrosion of the components that make up the deck.

1 is a side cross-sectional view showing a joining structure according to a first embodiment. FIG. 2 is a plan view showing the joint structure of FIG. 1 . FIG. 1 is a perspective view schematically showing a continuous fiber reinforcement material. FIG. 10 is a side cross-sectional view showing a joining structure according to a second embodiment. FIG. 5 is a plan view showing the joint structure of FIG. 4 . FIG. 11 is a perspective view showing a deck according to a third embodiment. FIG. 7 is a plan view showing the deck of FIG. 6. FIG. 7 is a side view showing the end face of the deck of FIG. 6. FIG. 10 is a perspective view showing a floor slab according to a fourth embodiment. FIG. 10 is a plan view showing the deck of FIG. 9 .

The following describes embodiments of deck slabs and deck slab joint structures according to the present disclosure, with reference to the drawings. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and duplicate explanations are omitted where appropriate. Furthermore, the drawings may be partially simplified or exaggerated to facilitate understanding, and dimensional proportions, etc., are not limited to those shown in the drawings.

(First embodiment)
Fig. 1 is a cross-sectional view showing a joint structure 1 according to a first embodiment. Fig. 2 is a plan view showing the joint structure 1. As shown in Figs. 1 and 2, the joint structure 1 includes a first floor slab 10, a second floor slab 20 provided at a position spaced apart from the first floor slab 10, and a filler material 30 filled between the first floor slab 10 and the second floor slab 20.

The first deck 10, the second deck 20, and the filler material 30 constitute, for example, a bridge. As an example, the bridge is a highway bridge. The bridge has, for example, multiple girders extending in the bridge axis direction D1, and the first deck 10 and the second deck 20 are arranged on the multiple girders so that they extend in the bridge axis direction D1 and in a direction perpendicular to the bridge axis D2. The bridge axis direction D2 is perpendicular to the bridge axis direction D1.

Each of the first and second floor slabs 10 and 20 is, for example, a precast concrete floor slab manufactured in advance in a factory. Each of the first and second floor slabs 10 and 20 is, for example, a UFC floor slab that does not contain reinforcing bars and is made of ultra-high strength fiber reinforced concrete (UFC). The first and second floor slabs 10 and 20 may also be made of ultra-high performance fiber reinforced cementitious composite (UHPFRC).

The first deck 10 has an upper surface 11 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 12 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side of the upper surface 11 of the first deck 10, and a first end surface 13 extending in the direction perpendicular to the bridge axis D2 and in the height direction D3. The height direction D3 coincides with the thickness direction of the first deck 10 and the second deck 20.

Each of the upper surface 11 and the lower surface 12 is, for example, flat. The first end surface 13 has a first convex portion 14 that protrudes toward the second floor slab 20 and a first concave portion 15 that is recessed in a direction away from the second floor slab 20. The first end surface 13 has, for example, multiple first convex portions 14. The first convex portions 14 protrude in a side view (when viewed horizontally), and the first concave portions 15 are recessed in a side view. The first convex portions 14 and first concave portions 15 are aligned along the height direction D3.

The first convex portion 14 has a trapezoidal shape, for example, having a top surface 14b and a pair of inclined surfaces 14c located on both sides in the height direction D3 when viewed from the top surface 14b. The first concave portion 15 has a trapezoidal shape, for example, having a bottom surface 15b and a pair of inclined surfaces 15c located on both sides in the height direction D3 when viewed from the bottom surface 15b. Each inclined surface 15c is provided on an extension (on the same plane) of the inclined surface 14c.

The configuration of the second deck 20 is, for example, similar to that of the first deck 10. The second deck 20 has an upper surface 21, a lower surface 22, and a second end surface 23 that faces the first end surface 13 in the bridge axis direction D1. The second end surface 23 has a second convex portion 24 that protrudes toward the first deck 10 and a second concave portion 25 that is recessed in a direction away from the first deck 10.

For example, the second convex portion 24 protrudes in a side view, and the second concave portion 25 is recessed in a side view. The second convex portion 24 has, for example, a top surface 24b and a pair of inclined surfaces 24c located on both sides in the height direction D3 when viewed from the top surface 24b, and the second concave portion 25 has a bottom surface 25b and a pair of inclined surfaces 25c located on both sides in the height direction D3 when viewed from the bottom surface 25b.

For example, in the joint structure 1, the first deck 10 and the second deck 20 are installed so that the top surface 14b of the first convex portion 14 and the top surface 24b of the second convex portion 24 face each other in the bridge axis direction D1, and the bottom surface 15b of the first recess 15 and the bottom surface 25b of the second recess 25 face each other in the bridge axis direction D1. However, in the joint structure, the first deck 10 and the second deck 20 may also be installed so that the top surface 14b of the first convex portion 14 and the bottom surface 25b of the second recess 25 face each other in the bridge axis direction D1, and the bottom surface 15b of the first recess 15 and the top surface 24b of the second convex portion 24 face each other in the bridge axis direction D1.

Furthermore, in the above description, an example has been described in which the first convex portion 14 is trapezoidal in shape with a top surface 14b and a pair of inclined surfaces 14c, and the first concave portion 15 is trapezoidal in shape with a bottom surface 15b and a pair of inclined surfaces 15c. However, the first convex portion 14 and the first concave portion 15 may be shaped other than trapezoidal. For example, the first convex portion may be rectangular in shape with a top surface, upper surface, and lower surface, and the first concave portion may be rectangular in shape with a bottom surface, upper surface, and lower surface. The same applies to the second convex portion 24 and the second concave portion 25.

For example, the filler 30 is a cement-based material that is fluid when filled and hardens after a certain period of time has passed since filling. The filler 30 may be non-shrinkage mortar, cast-in-place UFC, or UHPFRC, and various materials can be used as the filler 30.

The first deck 10 has a first continuous fiber reinforcement 16 that protrudes from the first end face 13 toward the second deck 20. The first continuous fiber reinforcement 16 extends, for example, along the bridge axis direction D1. A portion of the first continuous fiber reinforcement 16 is embedded in the first deck 10, and the depth of the portion of the first continuous fiber reinforcement 16 embedded in the first deck 10 (the length in the bridge axis direction D1) is equal to or greater than the length required for the concrete of the first deck 10 to be anchored. For example, the first deck 10 has multiple first continuous fiber reinforcements 16, which are aligned along the height direction D3. The multiple first continuous fiber reinforcements 16 are also aligned along the direction perpendicular to the bridge axis D2.

For example, the first continuous fiber reinforcement 16 protrudes from the first convex portion 14 (for example, from the top surface 14b of the first convex portion 14). However, the first continuous fiber reinforcement 16 may also protrude from the inclined surface 14c (or the inclined surface 15c) or from the first recess 15 (for example, from the bottom surface 15b of the first recess 15). In this way, the location from which the first continuous fiber reinforcement 16 protrudes is not particularly limited.

Like the first deck slab 10, the second deck 20 has second continuous fiber reinforcement 26 protruding from the second end face 23 toward the first deck slab 10. A portion of the second continuous fiber reinforcement 26 is embedded in the second deck slab 20, and the depth of the portion of the second continuous fiber reinforcement 26 embedded in the second deck slab 20 is equal to or greater than the length that allows the concrete of the second deck slab 20 to settle. The second deck slab 20 has multiple second continuous fiber reinforcement 26, which are aligned along both the direction perpendicular to the bridge axis D2 and the height direction D3.

For example, the second continuous fiber reinforcement 26 protrudes from the second convex portion 24 (for example, from the top surface 24b of the second convex portion 24). However, like the first continuous fiber reinforcement 16, the location from which the second continuous fiber reinforcement 26 protrudes is not particularly limited. For example, the position in the height direction D3 of the second continuous fiber reinforcement 26 is the same as the position in the height direction D3 of the first continuous fiber reinforcement 16.

For example, in a plan view (when viewed along the height direction D3), the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are arranged alternately along the direction perpendicular to the bridge axis D2. However, the positions of the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are not limited to the above example and can be changed as appropriate. Furthermore, the configuration of the first continuous fiber reinforcement 16 is, for example, the same as the configuration of the second continuous fiber reinforcement 26. Therefore, hereinafter, when there is no need to distinguish between the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26, the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 will be collectively referred to as continuous fiber reinforcement 6.

Figure 3 is a perspective view schematically showing a continuous fiber reinforcement material 6. As shown in Figure 3, the continuous fiber reinforcement material 6 is, for example, a continuous fiber reinforcement strand. In other words, the continuous fiber reinforcement material 6 is made up of multiple strands 7 formed by bundling continuous fibers, twisted together, and hardened with resin. The continuous fiber reinforcement material 6 has higher rust resistance than rebar and is made from a material that is more corrosion-resistant than iron.

The continuous fiber reinforcement 6 is, for example, a carbon fiber rod. As an example, the continuous fiber reinforcement 6 includes a plurality of strands 7, which are twisted together in a spiral shape. The strands 7 contain a resin. The strands 7 are made of, for example, a matrix resin. Examples of matrix resins include epoxy resin, vinyl ester resin, etc. The strands 7 may also be reinforced with, for example, carbon fiber, aramid fiber, basalt fiber, or glass fiber.

Next, the effects achieved by the joint structure 1 according to this embodiment will be described. As shown in FIGS. 1 and 2, in the joint structure 1, the first floor slab 10 has a first end face 13 facing the second floor slab 20, and the second floor slab 20 has a second end face 23 facing the first floor slab 10. Filling material 30 is filled between the first end face 13 and the second end face 23. The first floor slab 10 has a first continuous fiber reinforcement 16 protruding from the first end face 13, and the second floor slab 20 has a second continuous fiber reinforcement 26 protruding from the second end face 23. Therefore, the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26, which are not rebar but are resistant to rust, protrude from the first end face 13 and the second end face 23, respectively, thereby reducing the possibility of corrosion. This more reliably suppresses corrosion of the components that make up the first floor slab 10 and the second floor slab 20, improving the reliability of corrosion prevention.

Furthermore, the first end face 13 is formed with a first convex portion 14 that protrudes toward the second floor slab 20 and a first concave portion 15 that is concave in a direction away from the second floor slab 20. The second end face 23 is formed with a second convex portion 24 that protrudes toward the first floor slab 10 and a second concave portion 25 that is concave in a direction away from the first floor slab 10. For example, each of the first convex portion 14 and the second convex portion 24 protrudes in a side view, and each of the first concave portion 15 and the second concave portion 25 is concave in a side view. Therefore, the shear force in the height direction D3 acting between each of the first floor slab 10 and the second floor slab 20 and the filler material 30 can be more effectively transmitted, thereby increasing the shear strength.

In this embodiment, the first and second floor slabs 10 and 20 do not contain rebar and are made of ultra-high-strength fiber-reinforced concrete. Therefore, because the first and second floor slabs 10 and 20 do not contain rebar, corrosion of the components that make up the first and second floor slabs 10 and 20 can be more reliably avoided. Furthermore, because the first and second floor slabs 10 and 20 do not contain rebar and are made of ultra-high-strength fiber-reinforced concrete, the first and second floor slabs 10 and 20 can be made thinner while maintaining high strength.

In this embodiment, the filler material 30 is made of ultra-high-strength fiber-reinforced concrete. This allows the distance between the first end face 13 and the second end face 23 to be shortened while maintaining high strength, and eliminates the need for reinforcing bars to be placed between the first end face 13 and the second end face 23.

Second Embodiment
Next, a joint structure 41 according to a second embodiment will be described with reference to Figures 4 and 5. Part of the configuration of the joint structure 41 is the same as part of the configuration of the joint structure 1 described above. Therefore, in the following description, parts that overlap with the description of the joint structure 1 will be given the same reference numerals and will be omitted as appropriate. The joint structure 41 includes a support member 42 extending in the bridge axis direction D1, a first deck 50 and a second deck 60 arranged on the support member 42 so as to be aligned in the direction perpendicular to the bridge axis D2, and a filler material 30 filled between the first deck 50 and the second deck 60.

The support member 42 is, for example, a steel girder having an upper flange 42b, a web 42c, and a lower flange 42d. However, the support member 42 is not limited to a steel girder and may be, for example, a precast concrete girder. The joint structure 41 is installed at site A, which, for example, is a construction site on a highway. For example, at site A, deck renewal work is being carried out on the first deck 50 and the second deck 60.

For example, the first deck 50 and the second deck 60 have a short side extending in the bridge axis direction D1 and a long side extending in the direction perpendicular to the bridge axis D2, and are rectangular plates with a thickness in the height direction D3. The first deck 50 and the second deck 60 are, for example, UFC decks made of ultra-high-strength fiber-reinforced concrete, similar to the first deck 10 and the second deck 20 described above. The material of the first deck 50 and the second deck 60 is, for example, the same as the material of the first deck 10 and the second deck 20.

The first deck 50 has an upper surface 51 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 52 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side of the upper surface 51 of the first deck 50, and a first end surface 53 extending in the bridge axis direction D1 and in the height direction D3. The first end surface 53 has a first convex portion 54 protruding toward the second deck 20 and a first concave portion 55 recessed in a direction away from the second deck 60.

The first convex portion 54 protrudes in a plan view, and the first concave portion 55 is recessed in a plan view. The first convex portion 54 and the first concave portion 55 are aligned along the bridge axis direction D1. The shapes of the first convex portion 54 and the first concave portion 55 are, for example, the same as the shapes of the first convex portion 14 and the first concave portion 15 described above. Therefore, a detailed description of the shapes of the first convex portion 54 and the first concave portion 55 will be omitted.

The configuration of the second deck 60 is similar to that of the first deck 50, for example. The second deck 60 has an upper surface 61, a lower surface 62, and a second end surface 63 that faces the first end surface 53 in the direction perpendicular to the bridge axis D2. The second end surface 63 has a second convex portion 64 that protrudes toward the first deck 50 and a second concave portion 65 that is recessed in a direction away from the first deck 50.

The second convex portion 64 protrudes in a plan view, and the second concave portion 65 is recessed in a plan view. The shape and arrangement of the second convex portion 64 and the second concave portion 65 are, for example, similar to the shape and arrangement of the second convex portion 24 and the second concave portion 25 described above. Therefore, a detailed description of the shape and arrangement of the second convex portion 64 and the second concave portion 65 will be omitted.

The first deck 50, like the first deck 10 described above, has a first continuous fiber reinforcement 16 protruding from the first end face 53 toward the second deck 60. The second deck 60, like the second deck 20 described above, has a second continuous fiber reinforcement 26 protruding from the second end face 63 toward the first deck 50.

In the first deck 50, multiple first continuous fiber reinforcements 16 are aligned along both the bridge axis direction D1 and the height direction D3. Similarly, in the second deck 60, multiple second continuous fiber reinforcements 26 are aligned along both the bridge axis direction D1 and the height direction D3. In the joint structure 41, the first continuous fiber reinforcements 16 and second continuous fiber reinforcements 26 are aligned alternately in a plan view.

The joint structure 41 includes a shear stopper member 43 that fits between the first deck slab 50 and the second deck slab 60. The shear stopper member 43 is, for example, a stud dowel (headed stud). The shear stopper member 43 has, for example, a fixed portion 43b fixed to the upper flange 42b of the support member 42 and a rod-shaped portion 43c extending in a rod-like manner from the fixed portion 43b along the height direction D3.

For example, the joint structure 41 has multiple shear stop members 43, which are aligned along the bridge axis direction D1. For example, the multiple shear stop members 43 are aligned along the direction perpendicular to the bridge axis D2. In the joint structure 41, the shear stop members 43 are integrated with the filler material 30, and the first deck slab 50 and the second deck slab 60 are each integrated with the filler material 30.

As described above, the joint structure 41 according to the second embodiment includes a support member 42 that supports the first and second decks 50 and 60, which face each other above the support member 42 along the direction D2 perpendicular to the bridge axis. Each of the first convex portion 54 and the second convex portion 64 protrudes in plan view, and each of the first and second concave portions 55 and 65 is recessed in plan view.

As described above, when the first and second decks 50 and 60 face each other on the support member 42 along the bridge axis-perpendicular direction D2, and the joint between the first and second decks 50 and 60 is located on the support member 42, negative bending, which results in upper edge tension, may act on the joint. In contrast, in the second embodiment, the first continuous fiber reinforcement 16 and the second continuous fiber reinforcement 26 are fixed to the first and second decks 50 and 60, respectively, and the filler 30, thereby resisting the negative bending. Furthermore, the first convex portion 54 and the second convex portion 64 protrude in plan view, while the first and second concave portions 55 and 65 are recessed in plan view. In other words, in the joint structure 41, the first end face 53 and the second end face 63 are uneven in plan view, thereby more effectively transmitting horizontal shear forces to the first and second decks 50 and 60, respectively, and the filler 30.

The joint structure 41 includes a support member 42 that supports the first and second slabs 50 and 60, and a shear stop member 43 that protrudes upward from the support member 42 and fits between the first and second slabs 50 and 60. The shear stop member 43 therefore transmits horizontal shear forces between the support member 42 and the filler material 30, and the unevenness of the first and second slabs 50 and 60 allows horizontal shear forces to be transmitted between the filler material 30 and each of the first and second slabs 50 and 60. This more reliably prevents the filler material 30 and the first and second slabs 50 and 60 from shifting relative to the support member 42.

(Third embodiment)
Next, a floor slab 70 according to a third embodiment will be described with reference to Figures 6, 7, and 8. The floor slab 70 can be used, for example, in place of the first floor slab 50 or the second floor slab 60 described above. Furthermore, the floor slab 70 can also be used in place of the first floor slab 10 or the second floor slab 20 described above. Figure 6 is a perspective view of an end surface 73 of the floor slab 70 as seen from below. Figure 7 is a plan view showing the end surface 73 of the floor slab 70. Figure 8 is a front view of the end surface 73.

The deck slab 70 has, for example, reinforcing bars 76. However, the deck slab 70 does not need to have reinforcing bars 76, for example, if the deck slab 70 is a UFC deck. The deck slab 70 has an upper surface 71 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 72 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side of the upper surface 71 of the deck slab 70, and an end surface 73 extending in the direction perpendicular to the bridge axis D2 and in the height direction D3.

End face 73 is the surface facing the other deck slab. Filling material (e.g., filler material 30) is filled between end face 73 and the other deck slab. End face 73 has a convex portion 74 that protrudes toward the other deck slab and a concave portion 75 that is recessed in a direction away from the other deck slab. End face 73 has multiple convex portions 74 and multiple concave portions 75.

For example, the convex portion 74 protrudes in a plan view, and the concave portion 75 is recessed in a plan view. As an example, the convex portion 74 and the concave portion 75 are aligned along the direction D2 perpendicular to the bridge axis. However, in the third embodiment, the convex portion 74 and the concave portion 75 may be aligned along the bridge axis direction D1 or the height direction D3, and the direction in which the convex portion 74 and the concave portion 75 are aligned is not particularly limited.

The convex portion 74 has, for example, a top surface 77 and multiple inclined surfaces 78 that are inclined in the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The concave portion 75 has, for example, a bottom surface 79 and multiple inclined surfaces 80 that are inclined in the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. Each inclined surface 80 is provided on an extension (on the same plane) of each inclined surface 78. The inclined surface 78 of one convex portion 74 is inclined so as to approach or move away from other convex portions 74 as it moves from one side to the other in the height direction D3. In other words, the inclined surfaces 78 are inclined in the direction in which the convex portion 74 widens or narrows as it moves from one side to the other in the height direction D3.

Reinforcing bars 76 protrude from the convex portion 74. The deck slab 70 has, for example, a plurality of reinforcing bars 76 arranged along the height direction D3. As an example, the reinforcing bars 76 protrude from the top surface 77 of the convex portion 74, and the reinforcing bars 76 are arranged in pairs above and below the top surface 77. However, the deck slab 70 does not need to have reinforcing bars 76; for example, the deck slab 70 may have the continuous fiber reinforcement material 6 described above instead of the reinforcing bars 76.

For example, the top surface 77 is a flat surface. As an example, the top surface 77 is hand-drum shaped. In this case, the horizontal length of the top surface 77 (for example, the direction perpendicular to the bridge axis D2) increases from the center of the height direction D3 of the end surface 73 toward each end in the height direction D3. For example, the bottom surface 79 is a flat surface. As an example, the bottom surface 79 is hexagonal shaped. In this case, the horizontal length of the bottom surface 79 decreases from the center of the height direction D3 of the end surface 73 toward each end in the height direction D3.

For example, the inclined surface 78 is flat. As one example, the inclined surface 78 has a rectangular shape. The multiple inclined surfaces 78 have a first inclined surface 78b located on one side (e.g., the upper side) in the height direction D3 and a second inclined surface 78c located on the other side (e.g., the lower side) in the height direction D3. The orientation of the first inclined surface 78b is different from the orientation of the second inclined surface 78c. The first inclined surface 78b of one convex portion 74 is inclined so as to move away from the other convex portions 74 (in the direction in which the convex portions 74 narrow) as it moves downward from the upper end. Furthermore, the second inclined surface 78c of one convex portion 74 is inclined so as to move closer to the other convex portions 74 (in the direction in which the convex portions 74 widen) as it moves downward from the upper end.

The first inclined surface 78b faces either diagonally downward or diagonally upward, and the second inclined surface 78c faces the other diagonally downward or diagonally upward. As a specific example, the first inclined surface 78b faces diagonally downward, and the second inclined surface 78c faces diagonally upward. In other words, the normal to the first inclined surface 78b extends diagonally downward from the first inclined surface 78b, and the normal to the second inclined surface 78c extends diagonally upward from the second inclined surface 78c.

As described above, the deck 70 according to the third embodiment has an end surface 73 facing the other deck slabs, and a convex portion 74 protruding toward the other deck slabs is formed on the end surface 73. Therefore, after filler material is filled between the deck slab 70 and the other deck slab, the shear force acting between each deck slab and the filler material can be more effectively transmitted, thereby increasing shear strength. Furthermore, the convex portion 74 formed on the end surface 73 facing the other deck slab has an inclined surface 78 that is inclined relative to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The inclined surface 78 is inclined so as to approach or move away from the other convex portion 74 as it moves from one side to the other in the height direction D3. Therefore, shear force can be transmitted between the deck slab 70 and the filler material via the inclined surface 78 in three directions: the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3, thereby transmitting shear force more effectively. Furthermore, the third embodiment allows for more reliable filling of the filler material 30 than the first embodiment. For example, in the first embodiment, there is a concern that air pockets may form under the protrusions, but in the third embodiment, the occurrence of such air pockets can be more reliably prevented.

In the deck slab 70 according to the third embodiment, the convex portion 74 has multiple inclined surfaces 78. The multiple inclined surfaces 78 include a first inclined surface 78b located on one side in the height direction D3 and a second inclined surface 78c located on the other side in the height direction D3. The first inclined surface 78b faces diagonally downward or diagonally upward (diagonally downward in the above example), and the second inclined surface 78c faces diagonally upward or diagonally downward (diagonally upward in the above example). Therefore, in both cases where the deck slab 70 is subjected to a downward shear force relative to the filler material, and where the filler material is subjected to a downward shear force relative to the deck slab 70, the shear force can be transmitted in three directions via either the first inclined surface 78b or the second inclined surface 78c. This allows for more effective transmission of shear forces between the deck slab 70 and the filler material.

The deck 70 according to the third embodiment may include reinforcing bars 76 protruding from the convex portions 74. This makes it easier to remove the formwork used in manufacturing the deck 70 compared to decks that include reinforcing bars protruding from portions other than the convex portions 74 (for example, the concave portions 75). This makes it easier to manufacture the deck 70.

(Fourth embodiment)
Next, a deck 90 according to a fourth embodiment will be described with reference to Figures 9 and 10. Like the deck 70, the deck 90 can be used in place of the first deck 50 or the second deck 60. A portion of the configuration of the deck 90 is the same as a portion of the configuration of the deck 70. Therefore, descriptions that overlap with the deck 70 will be omitted as appropriate.

Figure 9 is a perspective view of the end surface 93 of the deck slab 90 as seen from below. Figure 10 is a plan view showing the end surface 93 of the deck slab 90. As shown in Figures 9 and 10, the deck slab 90 has an upper surface 91 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2, a lower surface 92 extending in the bridge axis direction D1 and in the direction perpendicular to the bridge axis D2 on the opposite side to the upper surface 91 of the deck slab 90, and an end surface 93 extending in the direction perpendicular to the bridge axis D2 and in the height direction D3.

The end surface 93 has a convex portion 94 that protrudes toward the other deck slab mentioned above, and a concave portion 95 that is recessed in a direction away from the other deck slab. The convex portion 94 has, for example, a top surface 97 and multiple inclined surfaces 98 that are inclined with respect to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The concave portion 95 has, for example, a bottom surface 99 and multiple inclined surfaces 100 that are inclined with respect to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. The inclined surfaces 98 of one convex portion 94 are inclined so as to approach the other convex portions 94 (in the direction in which the convex portions 94 widen) as they move from the top end to the bottom end.

For example, the top surface 97 has a trapezoidal shape. In this case, the horizontal length of the top surface 97 (e.g., the direction perpendicular to the bridge axis D2) increases from one side (e.g., the upper side) to the other side (e.g., the lower side) in the height direction D3 of the end surface 93. For example, the bottom surface 99 has a trapezoidal shape. In this case, the horizontal length of the bottom surface 99 decreases from one side to the other in the height direction D3 of the end surface 93. For example, the inclined surface 98 has a rectangular shape. As an example, the inclined surface 98 has a parallelogram shape. The inclined surface 98 faces either diagonally downward or diagonally upward, and as an example, it faces diagonally upward. In other words, the normal to the inclined surface 98 extends diagonally upward from the inclined surface 98.

As described above, the deck 90 according to the fourth embodiment has an end surface 93 facing the other decks, and a convex portion 94 protruding toward the other decks is formed on the end surface 93. The convex portion 94 formed on the end surface 93 facing the other decks has an inclined surface 98 that is inclined relative to the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3. Therefore, shear forces can be transmitted between the deck 90 and the fill material via the inclined surface 98 in three directions: the bridge axis direction D1, the direction perpendicular to the bridge axis D2, and the height direction D3, allowing for more effective transmission of shear forces. Therefore, the deck 90 achieves the same effects as the deck 70. In the fourth embodiment, a deck 90 was described in which a convex portion 94 having an inclined surface 98 facing diagonally upward was formed. However, a deck slab may also be formed with a convex portion having both an inclined surface 98 facing diagonally upward and an inclined surface facing diagonally downward. In this way, the type and arrangement of the inclined surfaces of the convex portion of the deck slab can be modified as appropriate.

The above describes various embodiments of the deck slabs and deck slab joint structures according to the present disclosure. However, the deck slabs and deck slab joint structures according to the present disclosure are not limited to the above-described embodiments, and can be modified as appropriate within the scope of the gist set forth in the claims. In other words, the shape, size, material, number, and arrangement of each part of the deck slabs and deck slab joint structures can be modified as appropriate within the scope of the above-described gist.

For example, in the first embodiment described above, a joint structure 1 was described that includes a first deck 10 and a second deck 20 that face each other along the bridge axis direction D1, as shown in Figure 1. However, the first deck 10 and the second deck 20 may also face each other along the direction perpendicular to the bridge axis D2, and the direction in which the first deck 10 and the second deck 20 face each other is not particularly limited.

For example, in the second embodiment described above, a joint structure 41 was described that includes a shear stopper member 43 that is a stud dowel. However, the type of shear stopper member is not limited to a stud dowel. For example, the shear stopper member may be a perforated steel plate dowel. In other words, various shear stopper members can be used as long as they can be integrated with the filler material between the first and second deck slabs.

For example, in the third embodiment described above, a deck slab 70 was described that included a convex portion 74 with a top surface 77 that is hand-drum shaped, and a concave portion 75 with a bottom surface 79 that is hexagonal. However, instead of the convex portion 74 and the concave portion 75, the deck slab may include a convex portion with a top surface that is hexagonal, and a concave portion with a bottom surface that is hand-drum shaped. In other words, the convex and concave portions of the deck slab 70 may be reversed. Furthermore, the shapes of the convex and concave portions of the deck slab 70 are not limited to those of the above-described embodiment and can be modified as appropriate. The same applies to the deck slab 90 according to the fourth embodiment.

1, 41...joint structure, 6...continuous fiber reinforcement, 7...strand, 10...first floor slab, 11...upper surface, 12...lower surface, 13...first end surface, 14...first convex portion, 14b...top surface, 14c...inclined surface, 15...first recess, 15b...bottom surface, 15c...inclined surface, 16...first continuous fiber reinforcement, 20...second floor slab, 21...upper surface, 22...lower surface, 23...second end surface, 24...second convex portion, 24b...top surface, 24c...inclined surface, 25...second recess, 25b...bottom surface, 25c...inclined surface, 26...second continuous fiber reinforcement, 30...filling material, 42...support member, 42b...upper flange, 42c...web, 42d...lower flange, 43...slip prevention member, 43b...fixing portion, 43c...rod-shaped portion, 5 0...first floor slab, 51...upper surface, 52...lower surface, 53...first end surface, 54...first convex portion, 55...first concave portion, 60...second floor slab, 61...upper surface, 62...lower surface, 63...second end surface, 64...second convex portion, 65...second concave portion, 70...floor slab, 71...upper surface, 72...lower surface, 73...end surface, 74...convex portion, 75...concave portion, 76...reinforcing bar, 77...top surface , 78...inclined surface, 78b...first inclined surface, 78c...second inclined surface, 79...bottom surface, 80...inclined surface, 90...deck slab, 91...top surface, 92...bottom surface, 93...end surface, 94...convex portion, 95...concave portion, 97...top surface, 98...inclined surface, 99...bottom surface, 100...inclined surface, A...site, D1...bridge axis direction, D2...direction perpendicular to the bridge axis, D3...height direction.

Claims (5)

A first deck extending in the bridge axis direction, the bridge axis perpendicular direction perpendicular to the bridge axis direction, and the height direction perpendicular to both the bridge axis direction and the bridge axis perpendicular direction;
A second floor slab facing the first floor slab and extending in the bridge axis direction, the bridge axis perpendicular direction, and the height direction;
A filler material filled between the first floor slab and the second floor slab;
Equipped with
The first floor slab has a first end surface facing the second floor slab,
The second floor slab has a second end surface facing the first floor slab,
The first end surface is formed with a first convex portion protruding toward the second floor slab and a first concave portion recessed in a direction away from the second floor slab,
The second end surface is formed with a second convex portion protruding toward the first floor slab and a second concave portion recessed in a direction away from the first floor slab,
The first floor slab has a first continuous fiber reinforcement material protruding from the first end surface,
The second floor slab has a second continuous fiber reinforcement material protruding from the second end surface,
The first continuous fiber reinforcement material and the second continuous fiber reinforcement material are continuous fiber reinforced strands made of a material that has higher rust resistance than reinforcing bars and higher corrosion resistance than iron.
Joint structure. each of the first convex portion and the second convex portion protrudes in a side view,
Each of the first recess and the second recess is recessed in a side view.
The joining structure according to claim 1 . A support member supporting the first floor slab and the second floor slab is provided,
The first floor slab and the second floor slab face each other at the upper part of the support member,
each of the first convex portion and the second convex portion protrudes in a plan view,
Each of the first recess and the second recess is recessed in a plan view.
The joining structure according to claim 1 . A support member that supports the first floor slab and the second floor slab;
and a stopper member protruding upward from the support member.
The joint structure according to any one of claims 1 to 3. The first floor slab and the second floor slab do not have reinforcing bars and are made of fiber-reinforced concrete.
The joint structure according to any one of claims 1 to 4.